/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package control;

import database.database;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Widhaprasa Waliprana
 */
public class CategoryDelete extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet CategoryDelete</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet CategoryDelete at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
            */
            database db = new database();
            db.createConnection();

            String id = "";
            id = request.getParameter("category");

            int parentid = 0;
            db.select("SELECT * FROM categorydb WHERE categoryid="+Integer.parseInt(id));
            ResultSet rs = db.getResultSet();
            if(rs.next()){
                parentid = rs.getInt("parentid");
            }

            List<Integer> categoryID = new ArrayList<Integer>();
            List<Integer> deletedID = new ArrayList<Integer>();
            deletedID.add(Integer.parseInt(id));

            //out.print(db.isCategoryDescendant(10, 2));

            db.select("SELECT * FROM categorydb ORDER BY categoryid ASC");
            rs = db.getResultSet();
            while(rs.next()){
                  categoryID.add(rs.getInt("categoryid"));
            }

            for(int i: categoryID){
               if(db.isCategoryDescendant(i, Integer.parseInt(id)) && !deletedID.contains(i)){
                    deletedID.add(i);
                }
            }

            for(int i: deletedID){
                db.removeCategory(i);
            }

            db.closeConnection();
            if(parentid != 0){
                response.sendRedirect("Home/Admin.jsp?category="+parentid);
            }else{
                response.sendRedirect("Home/Admin.jsp");
            }

        } catch (SQLException ex) {
            Logger.getLogger(CategoryDelete.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(CategoryDelete.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
